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Leuc- :: Leuc- () A combining form signifying white, colorless; specif. (Chem.), denoting an extensive series of colorless organic compounds, obtained by reduction from certain other colored compounds; as, leucaniline, leucaurin, etc..

Is- :: Is- () Applied to certain compounds having the same composition but different properties; as in isocyanic.

Selenic :: Selenic (a.) Of or pertaining to selenium; derived from, or containing, selenium; specifically, designating those compounds in which the element has a higher valence as contrasted with selenious compounds..

Cinnamyl :: Cinnamyl (n.) The hypothetical radical, (C6H5.C2H2)2C, of cinnamic compounds..

Catalysis :: Catalysis (n.) A process by which reaction occurs in the presence of certain agents which were formerly believed to exert an influence by mere contact. It is now believed that such reactions are attended with the formation of an intermediate compound or compounds, so that by alternate composition and decomposition the agent is apparenty left unchanged; as, the catalysis of making ether from alcohol by means of sulphuric acid; or catalysis in the action of soluble ferments (as diastase, or ptyali

Mercurous :: Mercurous (a.) Of, pertaining to, or derived from, mercury; containing mercury; -- said of those compounds of mercury in which it is present in its highest proportion..

Thallous :: Thallous (a.) Of or pertaining to thallium; derived from, or containing, thallium; specifically, designating those compounds in which the element has a lower valence as contrasted with the thallic compounds..

Pound :: Pound (v. i.) To make a jarring noise, as in running; as, the engine pounds..

Sulphurine :: Sulphuric (a.) Derived from, or containing, sulphur; specifically, designating those compounds in which the element has a higher valence as contrasted with the sulphurous compounds; as, sulphuric acid..

Erythrine :: Erythrine (n.) A colorless crystalline substance, C20H22O10, extracted from certain lichens, as the various species of Rocella. It is a derivative of orsellinic acid. So called because of certain red compounds derived from it. Called also erythric acid..

Platinous :: Platinous (a.) Of, pertaining to, or containing, platinum; -- used specifically to designate those compounds in which the element has a lower valence, as contrasted with the platinic compounds; as, platinous chloride (PtCl2)..

Reaction :: Reaction (n.) The mutual or reciprocal action of chemical agents upon each other, or the action upon such chemical agents of some form of energy, as heat, light, or electricity, resulting in a chemical change in one or more of these agents, with the production of new compounds or the manifestation of distinctive characters. See Blowpipe reaction, Flame reaction, under Blowpipe, and Flame..

Normal :: Normal (a.) Denoting certain hypothetical compounds, as acids from which the real acids are obtained by dehydration; thus, normal sulphuric acid and normal nitric acid are respectively S(OH)6, and N(OH)5..

Ketine :: Ketine (n.) One of a series of organic bases obtained by the reduction of certain isonitroso compounds of the ketones. In general they are unstable oily substances having a pungent aromatic odor.

Candy :: Candy (n.) A weight, at Madras 500 pounds, at Bombay 560 pounds..

Selenium :: Selenium (n.) A nonmetallic element of the sulphur group, and analogous to sulphur in its compounds. It is found in small quantities with sulphur and some sulphur ores, and obtained in the free state as a dark reddish powder or crystalline mass, or as a dark metallic-looking substance. It exhibits under the action of light a remarkable variation in electric conductivity, and is used in certain electric apparatus. Symbol Se. Atomic weight 78.9..

Penny :: Penny (a.) Denoting pound weight for one thousand; -- used in combination, with respect to nails; as, tenpenny nails, nails of which one thousand weight ten pounds..

Cupric :: Cupric (a.) Of, pertaining to, or derived from, copper; containing copper; -- said of those compounds of copper in which this element is present in its lowest proportion..

Assayer :: Assayer (n.) One who assays. Specifically: One who examines metallic ores or compounds, for the purpose of determining the amount of any particular metal in the same, especially of gold or silver..

Tautomerism :: Tautomerism (n.) The condition, quality, or relation of metameric substances, or their respective derivatives, which are more or less interchangeable, according as one form or the other is the more stable. It is a special case of metamerism; thus, the lactam and the lactim compounds exhibit tautomerism..

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